oiling system mods

I can tell you that my mate's race Dart with 1/2" internal pick up system and approx 590hp motor lasted ok up to around 6600 trap rpm, soon as he started turning 6800>6900 it blew a rod out the side, many reasons for this but I suspect, without knowing exactly how much oil he ran in the sump it emptied it and starved a bearing?....go single line external would be my advice as I did in 1989 and your good to 7k in theory which is what he's done now with new 470 motor.